What was found
ON FLIGHT 4551 THE CREW REPORTED THAT DURING TAKEOFF BOTH PACKS WERE ON AND NOTICED A STRONG ODOR IN THE COCKPIT AND A LIGHT ODOR IN THE CABIN. DURING TOP OF DESCENT THRUST LEVERS AT IDLE THEY NOTICED AN OIL SMELL IN COCKPIT. NOTICED ENGINE NR 1 AT 11 QUARTS AT TAKEOFF. AT LANDING ON THE GROUND NR 2 ENGINE STAYED AT 12 QTS. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE NR 1 ENGINE 0 CARBON SEAL IAW RR MM 72-25-25. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.